What's the difference between dyestuff and naphthazarin?
Dyestuff
Definition:
(n.) A material used for dyeing.
Example Sentences:
(1) The vast majority of incidents occurred during the manufacture of chemicals or dyestuffs, and two particular workplaces were responsible for 70% of the cases.
(2) Mycobacterial acid-fastness seems most readily explainable on the basis of a "lipids barrier principle" that in the first instance hinders penetration of the water-soluble dyestuff, and in the second, hinders penetration of the bleaching acid.
(3) With a given type of coordination, the nature of the central atom has a decisive influence on the catalytic activity of the dyestuff, whereas substitution on the organic skeleton has only a slight effect.
(4) We use the disazo dyestuff Solaminrot 4B produced by VEB Chemiekombinat Bitterfeld.
(5) The method described here is as satisfactory for the detection of some commercial dyes as the methods developed by ETAD (Ecological and Toxicological Association of the Dyestuffs Manufacturing Industry).
(6) The study consisted of a literature survey, survey of on-going research and our project on the frequency and nature of MPC in an occupational cohort of Japanese dyestuff workers followed from 1962 through 1983.
(7) The chemical composition and biological action of a new food dyestuff separated from the grain sorhum film were studied.
(8) Selective binding of toluidine blue to basophilic proteoglycans is the first stage of a staining method which proceeds to the formation of a heavy metal salt of the dyestuff.
(9) Starting from the colorimetric data of some particular microscopic dyestuff the subtractive color spaces of a number of typical histologic stains are calculated.
(10) From 1 kg of the grain sorhum 169--248 g of the film are retrieved; and from this it is possible to obtain from 17 to 40 g of a flavonoid dyestuff that consists of cyanadine, quercitrol and pelargonidine.
(11) The authors consider that the hypocoagulative effect of cationic dyestuffs on the blood was caused by the thrombocytopenia and by the lowering of the platelet aggregation activity.
(12) The morphological changes in the uterine lymphatics in aging nulliparous and multiparous mice, as shown by the application of dyestuffs (patient blue violet and Japan ink) are described, and their appearance corresponds to that described in earlier papiers by Fabian (1976, 1977, 1978).
(13) At the same time, it is possible to confirm the suspicion of premature hydrorrhoea gravidarum by instillation of dyestuff into the amniotic cavity.
(14) In addition, more or less unsuccessful trials were made on twelve dyestuffs, some of which were new syntheses designed to combine chelating capacity with nucleophilia.
(15) In 732 cases of occupational eczemas, "para"-substances, chromates, plastic materials and adhesives, technical oils and fats, turpentine oil, dyestuffs and disinfectants were the principal noxious substances.
(16) Solaminrot 4B (VEB Chemiekombinat Bitterfeld) was used as dyestuff which enhances the normal birefringency of collagen fibrous material in tissue sections.
(17) The physical properties of experimental visible light-activated resins containing dyestuff, which could be quickly discolored by irradiation was, evaluated by analyzing light absorbance characteristics and measuring micro Vickers hardness.
(18) The present article briefly reviews some of Werner's contributions to organic chemistry, especially his studies of oximes, hydroxamic and hydroximic acids, phenanthrenes, syntheses, oxonium salts, dyestuffs, and optical activity.
(19) After thin-layer chromatography on high-performance thin-layer chromatographic plates with two different solvent mixtures, zeranol, estradiol, estriol and estrone are analysed as azo dyestuffs.
(20) As a second part of the strategy, the paper addresses more general questions relating to the ultimate fate of dyestuffs when discharged in aqueous effluents and in particular considers their most likely environmental distribution, their potential for bioaccumulation, and their biodegradability.
Naphthazarin
Definition:
(n.) A dyestuff, resembling alizarin, obtained from naphthoquinone as a red crystalline substance with a bright green, metallic luster; -- called also naphthalizarin.
Example Sentences:
(1) A number of 2-chloromethyl and 2-bromomethyl derivatives of naphthoquinones, quinolinediones, and naphthazarins were designed and synthesized as potential bioreductive alkylating agents, and the antitumor activity of these compounds was assessed in mice bearing Sarcoma 180 ascites cells.
(2) Among naphthol derivatives tested in the Ames assay, 5,8-dihydroxy-1,4-naphthoquinone or naphthazarin was found to be the most effective inhibitor of benzo(a)pyrene mutagenicity.
(3) Naphthazarin (5,8-dihydroxy-1,4-naphthoquinone), the basic unit of several tetracyclic antitumor antibiotics, and its glutathione conjugate were reduced by the one- and two-electron transfer flavoproteins NADPH-cytochrome P450 reductase and DT-diaphorase to their semi- and hydroquinone forms, respectively.
(4) Screening results indicated that 1,4-diacetyl-6,7-dimethyl-4a,5,8,8a-tetrahydronaphthalene and 5,8-bis(benzoyloxy)-2,3-dimethyl-1,4-naphthoquinone possessed borderline activity against leukemia P388 and that naphthazarin diacetate possessed confirmed cytotoxicity against the cell culture of human epidermoid carcinoma of the nasopharynx.
(5) Tricrozarin A exhibits antimicrobial activity against gram-positive bacteria, fungi, and yeast in vitro and is the first tetra-oxygenated naphthazarin derivative isolated from higher plants.
(6) The present results are discussed in terms of the relative contribution of one- and two-electron transfer flavoproteins to the bioreductive activation of naphthazarin and its glutathionyl conjugate as well as the importance of autoxidation reactions in the mechanism(s) of quinone cytotoxicity.
(7) DT-diaphorase reduced the naphthazarin-glutathione conjugate with an efficiency 5-fold lower than that observed with the parent quinone.
(8) Metabolite separations showed a decrease in microsomal metabolism of benzo(a)pyrene and of benzo(a)pyrene-7,8-dihydrodoil upon addition of naphthazarin.
(9) Naphthazarine and SQA were found to be ineffective on induction of SCEs.
(10) Since both NADP and dicoumarol inhibited the naphthazarin-stimulated non-stoichiometric consumption of NADPH and oxygen then naphthazarin redox cycling probably involves both DT-diaphorase and NADPH cytochrome P-450 reductase.
(11) Some 2,3-bis(substituted methyl)naphthazarins and related compounds were synthesized by the Diels-Alder reaction of benzoquinone and 2,3-dimethylbutadiene followed by oxidation and substitution reactions.
(12) The nucleophilic addition of GSH to naphthazarin proceeded with GSH consumption at rates slower than those observed with 1,4-naphthoquinone and its monohydroxy derivative, 5-hydroxy-1,4-naphthoquinone.
(13) A novel naphthazarin derivative, tricrozarin A, has been isolated from the fresh bulbs of Tritonia crocosmaeflora and was characterized as 5,8-dihydroxy-2,3-dimethoxy-6,7-methylenedioxy-1,4-naphthoquinone (2,3-dimethoxy-6,7-methylenedioxynaphthazarin).
(14) Both enzymes hydroxylated juglone, naphthazarin, 1,4-naphthoquinone and 2-chloro-1,4-naphthoquinone, but they were completely inactive against naphtholes.
(15) The inhibitory activity is due in part to the redox cycling of naphthazarin with the concommitant transfer of reducing equivalents from NADPH to molecular oxygen, thus diverting electrons from cytochrome P-450 enzymes.
(16) Except for one of the synthetics, naphthazarin, which is no longer fractured, we had samples of all of these.
(17) The effect of diplatinum complexes of the binucleating ligands of naphthazarine and squaric acid on Sister Chromatid Exchange (SCE) rates and human lymphocyte proliferation kinetics was studied.
(18) Superoxide dismutase at catalytic concentrations (nM range) enhanced slightly (1.1- to 1.6-fold) the autoxidation following the enzymatic catalysis of naphthazarin.
(19) Autoxidation accompanied the DT-diaphorase and NADPH-cytochrome P450 reductase catalysis of naphthazarin and its glutathionyl adduct as well as the 1,4-reductive addition of GSH to naphthazarin.